This 3-season synthetic sleeping bag is made from Polarloft synthetic insulation but it also benefits from a silver barrier liner to reduce loss of radiant heat, and it is claimed that this adds 3 degrees of extra warmth – which is probably one reason why the weight of this bag is so low at just 1540g. It is rated as comfortable down to -3 deg C under the EN13537 test method. Mountain Equipment however gives a recommended sleepzone of +15 to -10: confusing to put it mildly, but this should be fine for 3-season use. The bag comes in a compression stuffsack which is substantially smaller once compressed – which just proves you need to check such figures closely as it is the compressed size that is important when backpacking. Get the bag out and the set of features are ideal for 3-season use. Firstly the zip has an anti-snag strip. Behind the zip there is a substantial baffle to prevent getting a chill from the zip. There is a shoulder baffle too – essential, particularly in summer when you may not have the hood fully done up. The hood is well-contoured to fit around the head, too. Get in the bag, and there is good space to flex your legs and it generally feels comfortable. The drawcords and zips are relatively easy to use and they draw in the collar and hood very well. Finally there is exceptional water resistance, which is essential to prevent the insulation becoming damp. But the Mithril II will not be perfect for everyone. Firstly it is not quite as warm as others in its class around the chest. Although the shoulder baffles and zip baffles are good, they’re not as good as some others. The price is excellent but if you want the warmest bag, then this is not the best. The temperature ratings are confusing to anyone other than the very experienced, but this is a problem with many bags at the moment.
Inner: Ultrasoft 300dp
Insulation: Polarloft with Polarloft Radiant barrier silver liner
Packed size: 42x25cm; 25x24cm compressed
Weight: 1540g (bag only); 1665g with stuffsack
Made in China
Stores in the UK: England 35; Wales 10; Scotland 5; Ireland 0
Verdict: Buy it if you want a superb bag under £100 that has a good, all-round set of features coupled with low weight and small packed size.